Auxiliary flange female die structure

Abstract

The utility model belongs to the wind power blade manufacturing technical field, specifically disclose a kind of auxiliary flange female die structure, including pultrusion plate female die, pultrusion plate female die is made of glass fibre reinforced composite material;The lower surface profile of pultrusion plate female die is matched with auxiliary flange design surface profile;The length of pultrusion plate female die is customized according to wind power blade axial auxiliary flange area, the width of pultrusion plate female die is 120mm, wherein 80mm area is used to cover the upper surface of BBI core material, 40mm area is used to cover the folded portion of auxiliary flange cloth layer;Pultrusion plate female die outer surface is wrapped with non-porous release film or release cloth;Pultrusion plate female die is placed above the folded portion of auxiliary flange cloth layer that has been laid, auxiliary flange cloth layer one side is adhered to BBI core material chamfer, and the other side is adhered to the lower surface of pultrusion plate female die.Pultrusion plate female die is adapted with auxiliary flange surface profile, and is covered on the upper surface of BBI core material, can effectively constrain the form of shell in forming process, avoid the step and wrinkle of auxiliary flange position from the root.

Description

Technical Field

[0001] This utility model belongs to the field of wind turbine blade manufacturing technology, and in particular relates to an auxiliary flange female mold structure. Background Technology

[0002] In the manufacturing process of wind turbine blades, a BBI (Bonding Block Insert) structure is often used in the trailing edge mold area to enhance the bonding strength between the blade shells. The sandwich auxiliary flange, as an important component of the BBI structure, directly affects the overall structural performance and safety of the blade in terms of its molding quality. However, in traditional processes, the auxiliary flange fabric layer is prone to the following problems during folding, laying, and vacuum injection: Step defects: Due to poor adhesion of the fabric layer in the transition area between the core material and the flange, a height difference (step) is formed after curing, affecting the flatness of the subsequent bonding surface. Utility Model Content

[0003] The purpose of this invention is to provide an auxiliary flange female mold structure to solve the problem of step defects that occur in the existing auxiliary flange forming process.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: an auxiliary flange female mold structure, including a pultruded plate female mold, wherein the pultruded plate female mold is made of glass fiber reinforced composite material; the lower surface contour of the pultruded plate female mold matches the design profile of the auxiliary flange; the length of the pultruded plate female mold is customized according to the axial auxiliary flange area of ​​the wind turbine blade, and the width of the pultruded plate female mold is d, wherein... The area is used to cover the upper surface of the BBI core material. The area is used to cover the folded portion of the auxiliary flange fabric layer; the outer surface of the pultruded plate female die is wrapped with a non-porous release film or release cloth; the pultruded plate female die is placed above the folded portion of the laid auxiliary flange fabric layer, with one side of the auxiliary flange fabric layer attached to the chamfer of the BBI core material and the other side attached to the lower surface of the pultruded plate female die.

[0005] Furthermore, a 50mm wide biaxial anti-embedding cloth is provided at the folding position of the auxiliary flange cloth layer, and the biaxial anti-embedding cloth is located between the auxiliary flange cloth layer and the pultruded plate die.

[0006] Furthermore, the leading edge of the BBI core material is wrapped with fiberglass cloth, and the BBI core material wrapped with fiberglass cloth is further wrapped with core material wrapping cloth.

[0007] Furthermore, the fiberglass cloth has two layers, and the core material wrapping cloth has four layers. The four layers of core material wrapping cloth are arranged in a staggered manner, with each layer staggered by 5mm towards the rear edge.

[0008] Furthermore, the auxiliary flange fabric layer has three layers.

[0009] The beneficial effects of this technical solution are as follows:

[0010] ① Pultruded plate female dies can be mass-produced according to the standard profile of auxiliary flanges, eliminating the need for individual customization. They can be directly placed into the molding area during installation, simplifying the processing and installation process and significantly shortening the manufacturing cycle of auxiliary flanges. Pultruded plate female dies are reusable, replacing traditional disposable molds and reducing costs.

[0011] ② The pultruded die is adapted to the auxiliary flange profile and covers the upper surface of the BBI core material. This effectively constrains the shape of the shell during the molding process, fundamentally preventing steps and wrinkles from appearing at the auxiliary flange position, reducing subsequent repair processes, lowering the total production cost, and conforming to the concept of green manufacturing.

[0012] ③ The pultruded plate female mold is made of glass fiber reinforced composite material, which has excellent strength and rigidity. It is not easily deformed during the molding process and can continuously provide stable support for the shell, ensuring the structural accuracy and strength of the auxiliary flange after molding, which meets the long-term use requirements of wind turbine blades. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of an auxiliary flange female mold during the forming process of this utility model. Detailed Implementation

[0014] The following detailed description illustrates the specific implementation method:

[0015] The reference numerals in the accompanying drawings include: BBI core material 1, core material wrapping cloth 2, pultruded plate female mold 3, flow guide net 4, auxiliary flange cloth layer 5, VAP extraction bag 6.

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] The basic implementation examples are as follows: Figure 1 As shown: An auxiliary flange female mold structure includes a pultruded plate female mold 3, which is made of glass fiber reinforced composite material; the lower surface profile of the pultruded plate female mold 3 matches the design profile of the auxiliary flange; the length of the pultruded plate female mold 3 is customized according to the axial auxiliary flange area of ​​the wind turbine blade, and the width of the pultruded plate female mold 3 is d, where... The area is used to cover the upper surface of BBI core material 1. The area is used to cover the folded portion of the auxiliary flange fabric layer 5. In this embodiment, d is 120mm, of which 80mm is used to cover the upper surface of the BBI core material 1, and 40mm is used to cover the folded portion of the auxiliary flange fabric layer 5. The auxiliary flange fabric layer 5 has three layers. A 50mm wide biaxial anti-embedding cloth is provided at the folded position of the auxiliary flange fabric layer 5, and the biaxial anti-embedding cloth is located between the auxiliary flange fabric layer 5 and the pultrusion plate die 3. The outer surface of the pultrusion plate die 3 is wrapped with a non-porous release film or release cloth; the pultrusion plate die 3 is placed above the folded part of the laid auxiliary flange fabric layer 5, with one side of the auxiliary flange fabric layer 5 adhering to the chamfer of the BBI core material 1 and the other side adhering to the lower surface of the pultrusion plate die 3. The leading edge of the BBI core material 1 is wrapped with fiberglass cloth, and the BBI core material 1 wrapped with fiberglass cloth is wrapped by the core material wrapping cloth 2. The fiberglass cloth has two layers, and the core material wrapping cloth 2 has four layers. The four layers of core material wrapping cloth 2 are arranged in a staggered manner, with each layer staggered 5mm towards the rear edge.

[0018] The specific implementation process of molding is as follows:

[0019] 1. Laying BBI core material 1 and core material wrapping cloth 2: First, lay four layers of core material wrapping cloth 2 within the range of 43700-66500mm. The first layer extends 130mm beyond the BBI core material, and the next three layers are staggered by 5mm towards the rear edge. The shortest axial layer extends 150mm beyond the core material. Then, place the BBI core material 1, and then lay two layers of fiberglass cloth to wrap the front edge of the BBI core material 1. Finally, wrap the four layers of wrapping cloth down. The first layer still needs to extend 30mm beyond the core material, and the next three layers are staggered by 5mm towards the rear edge.

[0020] 2. Laying auxiliary flange fabric layer 5: Lay three layers of auxiliary flange fabric layer 5 with a width of 60mm within the axial range of 49500–65000mm. The auxiliary flange fabric layer 5 is laid symmetrically with the highest point of the chamfer on the side of the BBI core material 1 cavity as the center. One side is firmly attached to the chamfer of the BBI core material 1, and the other side is folded into the cavity. Use spray adhesive to fix the auxiliary flange fabric layer 5 in place to prevent the auxiliary flange fabric layer 5 from slipping.

[0021] 3. Anti-embedding measures: Lay a 50mm wide double-axis anti-embedding fabric at the folding position of the fabric layer to prevent fibers from embedding.

[0022] 4. Auxiliary Material Laying: After the auxiliary flange layer 5 is laid, cover the bonding surface entirely with release cloth to provide a rough surface for better bonding. Lay the prefabricated VAP vacuum bags 6, flush with the rear edge of the mold seam and laid towards the front edge. In this area, the VAP vacuum bags 6 provide momentum, balance the glue flow trend, and allow the lower resin and upper surface resin of the BBI core material 1 to converge in the area of ​​the VAP vacuum bags 6, avoiding encapsulation defects.

[0023] 5. Placement and Adjustment of Pultruded Plate Female Mold 3: First, wrap the 120mm wide pultruded plate female mold 3 with a non-porous release film or release cloth. Then, place 80mm of it on the BBI core material 1, ensuring it is firmly attached to the BBI core material 1 with chamfered edges. Cover the 40mm area of ​​the auxiliary flange cloth layer 5 with the folded area. Adjust the auxiliary flange cloth layer 5 section by section to ensure it fits tightly against the surface of the pultruded plate female mold 3. Sufficient allowance should be reserved in this area for the vacuum bag film to prevent the mold from deforming or breaking due to excessive tightness during vacuuming.

[0024] 6. Vacuum infusion and curing: Lay the guide net 4 to the fold of the fabric layer; seal the vacuum and perform normal resin infusion; after curing, remove the pultruded plate female mold 3 as a whole to achieve non-destructive demolding.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0026] The above descriptions are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are knowledgeable of all existing technologies in that field, and possess the ability to apply conventional experimental methods prior to that date. Therefore, those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in conjunction with their own capabilities. Typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An auxiliary flange female mold structure, characterized in that: The system includes a pultruded plate female mold (3), which is made of glass fiber reinforced composite material; the lower surface profile of the pultruded plate female mold (3) matches the design profile of the auxiliary flange; the length of the pultruded plate female mold (3) is customized according to the axial auxiliary flange area of ​​the wind turbine blade, and the width of the pultruded plate female mold (3) is d, wherein... The area is used to cover the upper surface of the BBI core material (1). The area is used to cover the folded portion of the auxiliary flange fabric layer (5); the outer surface of the pultruded plate female mold (3) is wrapped with a non-porous release film or release cloth; the pultruded plate female mold (3) is placed above the folded portion of the laid auxiliary flange fabric layer (5), one side of the auxiliary flange fabric layer (5) is attached to the chamfer of the BBI core material (1), and the other side is attached to the lower surface of the pultruded plate female mold (3).

2. The auxiliary flange female mold structure according to claim 1, characterized in that: The auxiliary flange fabric layer (5) is provided with a 50mm wide biaxial anti-embedding cloth at the folding position, and the biaxial anti-embedding cloth is located between the auxiliary flange fabric layer (5) and the pultruded plate die (3).

3. The auxiliary flange female mold structure according to claim 1, characterized in that: The leading edge of the BBI core material (1) is wrapped with fiberglass cloth, and the BBI core material (1) wrapped with fiberglass cloth is then wrapped with core material wrapping cloth (2).

4. The auxiliary flange female mold structure according to claim 3, characterized in that: The fiberglass cloth has two layers, and the core material wrapping cloth (2) has four layers. The four layers of the core material wrapping cloth (2) are arranged in a staggered manner, with each layer staggered 5mm towards the rear edge.

5. The auxiliary flange female mold structure according to claim 1, characterized in that: The auxiliary flange fabric layer (5) has three layers.

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